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#pragma once
#include <sdbusplus/bus.hpp>
namespace phosphor
{
namespace unit
{
namespace failure
{
/**
* @class Monitor
*
* This class will analyze a unit to see if it is in the failed
* state. If it is, it will either start or stop a target unit.
*
* The use case is for running from the OnFailure directive in a
* unit file. If that unit keeps failing and restarting, it will
* eventually exceed its rate limits and stop being restarted.
* This application will allow another unit to be started when that
* occurs.
*/
class Monitor
{
public:
/**
* The valid actions - either starting or stopping a unit
*/
enum class Action
{
start,
stop
};
Monitor() = delete;
Monitor(const Monitor&) = delete;
Monitor(Monitor&&) = default;
Monitor& operator=(const Monitor&) = delete;
Monitor& operator=(Monitor&&) = default;
~Monitor() = default;
/**
* Constructor
*
* @param[in] sourceUnit - the source unit
* @param[in] targetUnit - the target unit
* @param[in] action - the action to run on the target
*/
Monitor(const std::string& sourceUnit, const std::string& targetUnit,
Action action) :
bus(std::move(sdbusplus::bus::new_default())),
source(sourceUnit), target(targetUnit), action(action)
{
}
/**
* Analyzes the source unit to check if it is in a failed state.
* If it is, then it runs the action on the target unit.
*/
void analyze();
private:
/**
* Returns the dbus object path of the source unit
*/
std::string getSourceUnitPath();
/**
* Says if the unit object passed in has an
* ActiveState property equal to 'failed'.
*
* @param[in] path - the unit object path to check
*
* @return - true if this unit is in the failed state
*/
bool inFailedState(const std::string&& path);
/**
* Runs the action on the target unit.
*/
void runTargetAction();
/**
* The dbus object
*/
sdbusplus::bus::bus bus;
/**
* The source unit
*/
const std::string source;
/**
* The target unit
*/
const std::string target;
/**
* The action to run on the target if the source
* unit is in failed state.
*/
const Action action;
};
} // namespace failure
} // namespace unit
} // namespace phosphor
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